Supplemental Financial Information (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Property, Plant and Equipment [Line Items]
Gross	$ 205,198	$ 194,467
Accumulated Amortization	(167,887)	(155,318)
Property and equipment, Net	37,311	39,149
Software [Member]
Property, Plant and Equipment [Line Items]
Gross	39,508	37,136
Accumulated Amortization	(28,263)	(25,640)
Property and equipment, Net	11,245	11,496
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross	140,555	132,109
Accumulated Amortization	(120,478)	(111,308)
Property and equipment, Net	20,077	20,801
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross	20,008	19,654
Accumulated Amortization	(14,588)	(13,326)
Property and equipment, Net	5,420	6,328
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Gross	5,127	5,568
Accumulated Amortization	(4,558)	(5,044)
Property and equipment, Net	$ 569	$ 524